Unakite

Physical Properties

Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/orange; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Cleavage: None/Irregular; Specific Gravity: 2.85-3.00

Formation & Geological History

Formed through the hydrothermal alteration of granite, where plagioclase feldspar is replaced by epidote. Usually associated with the Proterozoic eon in the Appalachian Mountains.

Uses & Applications

Commonly used as a lapidary stone for beads, cabochons, carvings, and architectural accents like floor tiles or egg-shaped ornaments.

Geological Facts

Named after the Unaka Mountains in North Carolina/Tennessee where it was first discovered. It is the state rock of Virginia.

Field Identification & Locations

Identified by its unique 'pistachio green' epidote mixed with 'salmon pink' orthoclase feldspar. Frequently found as pebbles in riverbeds or on beaches in the Blue Ridge province.

Identified on: 4/28/2026

Mode: Standard